arm64: dts: imx8-apalis-ixora: Remove invalid ngpios property

Per fsl-imx-gpio.yaml, 'ngpios' is not a valid property.

Remove it to fix the following schema warning:

imx8qm-apalis-v1.1-ixora-v1.2.dtb: gpio@5d0d0000: 'ngpios' does not match any of the regexes: '^(hog-[0-9]+|.+-hog(-[0-9]+)?)$', 'pinctrl-[0-9]+'
	from schema $id: http://devicetree.org/schemas/gpio/fsl-imx-gpio.yaml#

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8-apalis-ixora-v1.1.dtsi

@@ -165,7 +165,6 @@
 			  "gpio5-24", "UART24-FORCEOFF", "gpio5-26",
 			  "LED-4-GREEN", "gpio5-28", "LED-4-RED", "gpio5-30",
 			  "gpio5-31";
-	ngpios = <32>;
 };
 
 /* Apalis PWM3, MXM3 pin 6 */

arch/arm64/boot/dts/freescale/imx8-apalis-ixora-v1.2.dtsi

@@ -212,7 +212,6 @@
 			  "gpio5-24", "UART24-FORCEOFF", "gpio5-26",
 			  "LED-4-GREEN", "gpio5-28", "LED-4-RED", "gpio5-30",
 			  "gpio5-31";
-	ngpios = <32>;
 };
 
 /* Apalis PWM3, MXM3 pin 6 */